Quote:
Originally Posted by 99350
Yes and no to the needing custom tunes for the extra exhaust you do not have to have it but you will be able to take full advantage with a tune.
All newer and older carbed vehicles are like this some manufacturers will see the extra power and detune to make the factory power after adding bolt-ons (Subaru is the worse)
Oh some food for thought if anyone is looking at making some big power #'s later on testing different collector lengths primary lengths etc can help get the last little bit f power out of the motor. (NASCAR guys are playing with them)
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That's probably why the easily exchanged shorty header, a simple exchange for the stock header, doesn't see any gains.
But the long tube header that needs some cutting and fabbing to get in requires the additional need for a custom tune. This is probably due to the increased collector length. Like you posted.
Then you throw in some high flow cats and your motor is really pushing the air out.
Lars
